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Related Concept Videos

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in...
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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UV–Vis Spectroscopy: Beer–Lambert Law01:09

UV–Vis Spectroscopy: Beer–Lambert Law

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The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The modern...
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UV–Vis Spectrum01:30

UV–Vis Spectrum

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When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar...
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Updated: Nov 12, 2025

Controlled Synthesis and Fluorescence Tracking of Highly Uniform PolyN-isopropylacrylamide Microgels
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Single and double scattering event analysis for ultraviolet communication channels.

Deva K Borah, Vinay R Mareddy, David G Voelz

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    This study introduces a faster UV channel analysis method for non-line-of-sight (NLOS) communication. The new approach significantly reduces computational costs for evaluating UV systems in various atmospheric conditions.

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    Area of Science:

    • Optical Wireless Communications
    • Atmospheric Optics
    • Signal Processing

    Background:

    • Non-line-of-sight (NLOS) ultraviolet (UV) communication systems face challenges in performance evaluation due to high computational costs.
    • Traditional Monte Carlo methods for path loss and impulse response calculations are computationally intensive, limiting real-time analysis under complex atmospheric conditions.

    Purpose of the Study:

    • To develop a computationally efficient channel analysis method for NLOS UV communication systems.
    • To improve the speed and reliability of UV communication system performance evaluations, especially under adverse atmospheric conditions.

    Main Methods:

    • A novel sample-based UV channel characterization approach is proposed.
    • The method utilizes fixed probability-based sampling, focusing on dominant single and double scattering events.
    • Analysis considers realistic non-planar conditions with various fog and dust aerosols.

    Main Results:

    • The proposed approach achieves computational performance improvements of multiple orders of magnitude compared to Monte Carlo methods.
    • Reliable channel characterization is demonstrated with significantly reduced complexity.
    • The method effectively models the impact of aerosols like fog and dust on UV signal propagation.

    Conclusions:

    • The sample-based method offers a computationally efficient alternative for UV channel analysis in NLOS systems.
    • This approach enables faster and more reliable performance evaluations under diverse atmospheric conditions.
    • The findings are crucial for advancing the practical deployment of UV communication technologies.